Smoke-consuming furnace



(No Model.) 4 Sheets-Sheet 1.

P. H. JACKSON.

SMOKE GONSUMING FURNACE.

No. 268,682. Patented Dec. 5,1882.

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(No Model.) 4 Sheets-Sheet 2.

P. H. JACKSON.

SMOKE GONSUMING FURNACE.

No. 268,682. Patented 1380.5, 1882.

(No Model.) 4 Sheets8h1eet 3. P. H. JACKSON. SMOKE GONSUMING FURNACE.

Patented Dec. 5; 1882.

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,4 Sheets-Sheet 4. P. H. JACKSON.

SMOKE GONSUMING FURNACE.

Patented M05, 1882.

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UNITED STAT S PATENT, @rrrca.

PETER H. JACKSON, OF SAN FRANCISCO, CALIFORNIA.

SMOKE-CONSUMING FURNACE.

SPEC!ILEI(3ATIG)1\T forming part of Letters Patent No. 268,682, datedDecember 1882.

Application filed June 29, 1882. (No model) To all whom it may concern:

Be it known that I, PETER. H. JAoKsoN, of the city and county of SanFrancisco, State of Ualifornia, have invented Improvements inSmoke-Consuming Furnaces; and I hereby declare the following to be afull, clear, and exact description thereof.

My invention relates to certain improvements in thecombustion of fuel,and to apparatus by which it may be carried out.

It consists of a fire-box to contain the fuel, with exterior andinterior passages, by which air issupplied at the bottom and top, andthrough the fuel from the sides.

My invention also consists of certain details of construction, ashereinafter fully described,

and specifically set out in the claims.

A self-regulating valve or damper in the escape-pipe controls thedischarge of the products of combustion.

, Referring to the accompanying drawings for a more complete explanationof my invention, Figure l is a vertical section of an apparatus showingthe applicationof my invention. Fig. 2 is a perspective view of thefuelchamber. Fig. 3 is a view of the central cone. Fig. 4 is ahorizontal section of the fuel-chamher, taken through mm, Fig. 1. Figs.5, 6, and 7 show the invention as applied to horizontal boilers. Fig.8shows the return-pipe for gases in connection with a furnace.

A is a fuel-chamber, having the grate B at i the bottom. Thefuel-chamber is inclosed by an outer casing, O, situated at such adistaiice from it as to leave an air-space around the fuel-chamber,through which air may pass up freely. This air-space extends up from thelevel'of the grate to the line of the top of the, fuel, and issubdividedinto two sets of spiral fiues, D and E. vOne set of these fines, D, haveclosed sides the entire length, being open only at the bottom and top.The other alternate set of fiues, E, have slots or' openings a on theinner side into the fuel-chamber, through which air' is admitted to thefuel at the sides. Both sets of these fines are drawn inwardly towardthe center at the top, so as to discharge a large body of heated airwith a whirling'motion over the top ofthe fuel.

A central tube or passage, F, extends up through the fuel-space, and hasvertical openthrough the fire.

ings b, through which air is admitted to the fuel from the inside aswell as the outside. A cone, G, having spirally-placed wings c, is fixedabove the passage F, so that the air which escapes through it will alsohave a whirling motion imparted to it, similar to'that discharged by theexterior flues, D and E. These fiues or passages all open into achamber, H, below the grate and within the outer casing, G. The bottomof this casing has an opening, into which is fitted the end of the largeair-supply pipe I. This pipe may receive and convey air from anysuitable blast apparatus or device, or it may be cut off at the dottedline a b and admit simply a natural draft. The return pipe or flue J,the use of which will be described hereinafter, enters the sideof thisair-pipe, and is curved, so that its discharge end is in the center ofthis air-pipe and just below the point where it opens into the chamberH; or

the air-pipe I may be central and the pipe J...

ence of the chamber. From its center the return pipe or fiue J leadsupward, passing out through the side of the drum M, thence downward intothe air-supply pipe and to a point fiector, P, extending nearly to thecircumferbeneath the chamber H, as before describedaa This constructionis precisely the same when applied to a straw-burning furnace, as shownin Fig. 6, exceptthat the sh ape of the chain bers are somewhatdifierent and the boiler-tubes form a part of the return system for theunconsumed gases; or the boiler-tubes may be the exit for the gases fromthe fireand then return through another pipe to beneath the grate-bars,to pass The operation will then be as follows: Fuel being placed in thechamberA and ignited, air will be drawn by natural draft; or it may beotherwise supplied through the passage I, be-

ing controlled by suitable dampers. This air I thence into thefuel-chamber, to be consumed.

. panded or contracted as the heat varies, or

. in-o the flue or pipe O to the chimney.

passes into the chamber H and through the grate B to the fuel, and afterthe latter is ignited the air which passes through the exterior spiralpassages. D and E, and theinterior passage, F, will be heated, part ofit passing into the fuel chamber through the openings at and b, and theremainder being delivered with a whirling motion inwardly and outwardlyover the top of the fuel, whereit meets the unconsumed gases escapingtherefrom, thus supplying fresh oxygen at the point where itis mostneeded. In order to still further cottsume these gases and produce thetnost coinplet-e combustion, they are collected by the hood P and passinto the pipe J. The draft from below, caused by the heated air passingthrough the-fuel, will return these nnconsumed gases to the point betowthe chamber H, where they are discharged around the dtstributer K andmixed with the column of inflowing airin the pipe I, passing into thechamber H, and- These hot returning gasesalso assist in heat-- ing andra-refying the inflowing air, which supplies combustion, so that thetemperature is kept up and the cotnbustion is much tnore perfect. In theapplication to steam-boilers and some kinds of furnaces it may be founddesirable to introduce a jet of steam through the center of the pipe 1or J to increase the draft; or this may be effected by any otherwell-known means.

Within the chimney or escape-pipe O is fixed a valve or damper, It,having an exterior operating-arm, S. This arm is connected with a bodyof mercury, which is contained in a tube or coil, T, and is so placedthat it will be exwith other automatic regulator which is operated bythe passing heat. The opening or closing of this damper It regulates thepassage of the products of combustion to the chimney.

hood P in the chamber M above the fire-place A, passing thence throughthe chamber N and Having thus described my invention, what I claim asnew,'and desire to secure by Letters Patent, is-

1. In aheating apparatus, the fuel-chamber A, the exterior casing, andthe air-pasages E, surrounding the chamber A, and having slots oropenings a, through which air may be. ad mitted to the fuel from thesides, substantially as herein described.

2. In a heating apparatus, the fuel-chamber A, with itsspirally-arranged surrounding airpassages D and E, discharging air abovethe fuel to mix with the gases arising therefrom, substantially asherein described.

3. In a heating apparatus, the fuel-chamber A, with its centralair-passage. F, having side openings, b, and the distributmgcone G,substantially as herein described.

4, In a heating apparatus, the fuel-chamber A, having the centralperforated air-passage, F, and the surrot'tiiding passages D and E, thealternate ones being perforated, and all discharging air above the fuel,substantially as hereittdescribeil.

5. In a heating apparatus, the fuel-chamber A having the central and thesurrounding airpassages, with their spirally-arranged discharge-passagesopening above the fuel, substantially as and for the purpose hereindescribed.

6. In a heating apparatus, the fuel-chamber A, with its central andsurrounding air and draft passages, the chamber H, to receive airandunconsumed gases from the pipes I and J, as shown, the chamber M, andcollecting-hood P, in combination with the escape flue or passage O,valve It,'and automatic opening and closing device, substantially asherein described.

7. In a heating apparatus, the fuel-chamber A, in combination with theupper chamber, L, and the collecting-hood P, pipe J. leading from thechamber N to the chamber H, and the airpipe 1, surrounding the dischargeend of pipe J, substantially as and for the purpose herein described.

In witness whereof I hereunto set my hand.

PETER H. JACKSON.

' Witnesses:

O. D. COLE, J. H. BLUOD.

